What article does this modification violate?

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What is wrong with this picture

What is wrong with this picture

No visible primary fusible disconnect or local lockable isolation switch to prevent tampering , no nameplate with matching Z factor. Locally within sight for maintenance should raise a volunteer to write a tag placed out of service dated and signed with primary energy source location identified.
 
What is wrong with this picture

What is wrong with this picture

Probably all Article 450 with reference to other identified articles to comply with.
 
nec_addicted said:
No visible primary fusible disconnect or local lockable isolation switch to prevent tampering , no nameplate with matching Z factor. Locally within sight for maintenance should raise a volunteer to write a tag placed out of service dated and signed with primary energy source location identified.
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Disco does not have to be within sight. Can be elsewhere, if location is identified on tranny.


450.14 Disconnecting Means. Transformers, other than Class 2 or Class 3 transformers, shall have a disconnecting means located either in sight of the transformer or in a remote loca- tion. Where located in a remote location, the disconnecting means shall be lockable in accordance with 110.25, and its location shall be field marked on the transformer.

And I just noticed something at top left, could be disco. OP would have to answer that though.
 
GoldDigger said:
I suspect that the transformer was listed and supplied with a solid or louvered sheet metal cover. Removing it and replacing it with the expanded metal would probably be a violation of the installation and use instructions of the transformer.
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From the "caved" or dented top I see on the transformer case, I suspect the cover was damaged and someone made that cover out of what I call "grill top grate". I've seen that mesh used as a top for a fire pit or crude home made grill.
 
Little Bill said:
From the "caved" or dented top I see on the transformer case, I suspect the cover was damaged and someone made that cover out of what I call "grill top grate". I've seen that mesh used as a top for a fire pit or crude home made grill.
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I'm more inclined to think the cover was lost during initial installation and the plant maintenance guys 'solved' the problem.
 
What jumper said. Also 110.3(B) - manufacturer's instructions. The mesh is a no-no. And I'm pretty sure that the transformer is not listed to be connected to some type of trough, or wireway. Amazing, and not in a good way...
 
GoldDigger said:
I suspect that the transformer was listed and supplied with a solid or louvered sheet metal cover. Removing it and replacing it with the expanded metal would probably be a violation of the installation and use instructions of the transformer.
Click to expand...

necGuru said:
What jumper said. Also 110.3(B) - manufacturer's instructions. The mesh is a no-no. And I'm pretty sure that the transformer is not listed to be connected to some type of trough, or wireway. Amazing, and not in a good way...
Click to expand...

So the instructions say "factory transformer enclosure shall not be removed and replaced with diamond mesh" ??
 
480sparky said:
I'm fairly certain diamond mesh isn't listed for use in a transformer enclosure. So I'll take 110.2 for $10,000,000, Alex.
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jumper said:
Most tranny specs also have a min clearance from walls and such. Usually a 6” min.
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jumper said:
450.8(B)

B) Case or Enclosure. Dry-type transformers shall be
provided with a noncombustible moisture-resistant case or
enclosure that provides protection against the accidental
insertions of foreign objects
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Jraef said:
450.8 requires all transformers to be enclosed, yes.
Also, 110.27 (A) requiring guarding of live parts:
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GoldDigger said:
I suspect that the transformer was listed and supplied with a solid or louvered sheet metal cover. Removing it and replacing it with the expanded metal would probably be a violation of the installation and use instructions of the transformer.
Click to expand...

necGuru said:
What jumper said. Also 110.3(B) - manufacturer's instructions. The mesh is a no-no. And I'm pretty sure that the transformer is not listed to be connected to some type of trough, or wireway. Amazing, and not in a good way...
Click to expand...

So maybe the real question is which articles doesn't this violate?
 
jumper said:
Most tranny specs also have a min clearance from walls and such. Usually a 6” min.
Click to expand...
Possibly lack of clearance on back prompted making more ventilation on the front?

jumper said:
450.8(B)

B) Case or Enclosure. Dry-type transformers shall be
provided with a noncombustible moisture-resistant case or
enclosure that provides protection against the accidental
insertions of foreign objects
Click to expand...
Original cover likely had a rather large opening though not with a direct line to live components. One could still insert and drop reasonably large conductive objects into the transformer housing though, you just couldn't easily contact a live component while still handling your foreign object.



petersonra said:
yes. and the fact is that a fair number of transformer enclosures come with louvers with slots larger than the grill here. the grill provides considerable protection against foreign object insertion. It does not say "prevention" of foreign object insertion.
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:thumbsup:
 
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